Okay, here's a weird video.
In the middle, there's a very rapid string of characters. I downloaded the video and slowed it down, getting the hex string 74696E7975726C2E636F6D2F4256552D383030
Converted to ASCII, it resolves to *********com/BVU-800?. Remove the ? and here you go.
It links to a file called foundonthetape_1.bsp on Megaupload.com. It is a TF2 map. Drop it into your /maps folder and open it up. Look up, turn on noclip and fly up... If it does something crazy, do me a favor and be ready to take a screenshot and record the sound then upload it. It's all pretty freaky and it looks like there's some further data hidden in the sound and picture file that pops up shortly...Proof that I got here first... But I'll let someone else upload a good picture BECAUSE SCREW Y'ALL THAT'S WHY ;P (Actually I've never played TF2 and have no friggin' idea what I'm doing in the Dev Console. You guys do better.)
Frankly, my money is on Valve dropping Half-Life 3 soon. Nevermind why :D
When I hit the checkerboard with a blue-team infantry, it flipped out and gave me a crazy sound and picture; didn't capture it 'cause I didn't know what I was doing. Sorry. PLEASE upload good copies of them ASAP, and if you can decompile .bsp files and extract the raw files themselves, even better! If you can do that, PM me and I'll just email you the file.
Cheers...

Reminds me of all those weird 'ghost videos' for horror movies, where there's ~~ghost~~ in the static or there's some ancient heavily damaged video that is the mystery and its solution. Except, in map form.

Sorry gentlemen, but how did that guy find those videos?
Did he just randomly watched one of the billions videos on Youtube, and decided to convert some random numbers to ASCII code, while the video hinted nothing?
Sounds reasonable enough.

Sorry gentlemen, but how did that guy find those videos?
Did he just randomly watched one of the billions videos on Youtube, and decided to convert some random numbers to ASCII code, while the video hinted nothing?
Sounds reasonable enough.

someone made a post on reddit that said "some teen brought in some VHS tapes for us to digitize. this was on the second one"

I would have to say "foundonthetape's" profile is partnered, I saw an ad on both videos, YouTube only partners people who:
actually have a sufficient amount of views/subscribers (this account doesn't)
or companies that request a partnership, cough Valve cough

Well...These are creepy. When I saw that pale-faced, long-haired, armless thing wandering towards the camera I kinda freaked out. Then there was the fat woman who looked up at the celing or somethign and sees the weird smashed-up face...At that point I didn't even have the guts to watch the "Screamer" one.

Didn't Gabe say in an interview that the next Half-Life game was going to be scary? What about all that wacked-out concept art that was at Valve?

They said most of the game would be similar to Ravenholm. So yes, some horror, but more of a feel of desperation and isolation I would think. Although Dougley has a good point, I am still doubtful this is a valve ARG. It just does not fit their style.

But, my friend told me yesterday that in an EP2 update there was a sound added named "data" which had some weird noise in it. Was he fucking with me or did it really happen? I didn't look into it myself.